If your coolant level is low, there is a chance that you will get air in the system, and the coolant temperature sensor will not read the coolant temperature correctly. However, as a fast test, you can check with a multimeter if power is coming to the radiator fan. Measuring the wirings with a multimeter is often not very effective, as you need to put a load on the wires to see if they are functional. Also, check the connector plugs at the relay and control unit. Check in the connector plugs for any signs of corrosion. If the fan is not working even when the car is overheating, there might be a wiring issue or a bad connection.Ĭheck the wirings going to the radiator fan from the control unit or relay. You need to check your repair manual of which temperature sensor controls the radiator fan and then resistance-measure the sensor with a multimeter to ensure it is functional. Some cars use separate engine coolant temperature sensors for the radiator fan and the engine control unit. If this temperature sensor is broken, the control unit will not know when to start the radiator fan. In both cases, the control units use a temperature sensor to know when to start the radiator fan. Either your fan control is integrated into the engine control unit, or you have a separate fan control module. There are often two different systems in different car models. Remember that if the fan fuse is blown – there might be a problem with the wirings or the radiator fan. The fan itself often uses a big fuse of around 50A, while there might also be a separate small fuse to the fan control module. If your car’s radiator fan is non-functional, check your car’s user manual and locate the fuse for the radiator fan controller or the fan. This is what we call a blown fuse.Ī blown fuse is no big deal, and changing one does not cost a lot of money. If there is an electrical surge going towards a piece of electronic equipment, the fuse cuts the electric supply to that particular equipment saving it from destruction. Blown FuseĪ fuse supports almost everything electrical in a car. Bad Fan Controller Module 7 Reasons Why Your Radiator Fan is Not Working 1.
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